well, the basing of if a hadith is correct is through looking at the text, does it go against the quran and seeing the ones who have transmitted us the hadith. If the ones who have transmitted us the hadith are people who are : 1.known, 2.trustworthy 3. have good memory 4. are known not to lie and not to forge, then a hadith is accepted as hasan/sahih ( there is a lot more which happens, just a basic overview) but a hadith is completely solidified if it is: mutawatir. Mutawatir means with multiple chains of narration. So if the same story or words are transmitted by different people.
if you are sking is every sngle hadith in bukhari 100% sahih, well i would guess no, in al of those thousands of hadith, 1 lie could have slipped in, his is because bukhari and al albani and darussalam are al humans, and maybe a lie wasnt spotted or something. If a hadith is sahih we muslims take it, wheterh we like it or not.
if a hadith is sahih it means it is sound and true